* AC/DC power supply selection (only for SF-620A)* Rechargeable battery 6V4.0AH* Discharge time: single tube/6 hours, double tube/3 hours* Power failure emergency function* Single and double fluorescent tube* Simulated AC power failure emergency test button* charging indicator* Luminous indicator* Wall hanging/handle* Volume: 406(L)*87(W)*82(H)mm* Package specifications: 1*12 units